英语翻译Under the Safe Drinking Water Act,the Environmental Prot

英语翻译Under the Safe Drinking Water Act,the Environmental Protection Agency is required either to approve individual state plans for controlling the discharge of wastes into underground water or to enforce its own plan for states without adequate regulations.翻译：安全饮用水法案的管制之下,环境保护署不仅被要求每个州的污水成为地下水,并且也被要求减率各自的方案与计划,即便是没有在州政府的充分管制之下.【我的疑问】individual,表示“各自的”,那为什么后面紧跟的是复数形式【 state plans 还有,希望高手润湿一下我的翻译,